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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Chapter 12

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2. If every employee belonged to a particular department, certain departments could be chosen for the survey, with every individual in those departments asked to participate. Other answers are also possible.
3. If each employee can be classified as either a manager or a nonmanager, ensure that the sample proportion for each type is similar to the proportion of managers and nonmanagers in the company. Other answers are also possible.

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